The furnace, refrigerator, thermostat and CO and propane detectors all work off of 12 v house battery(ies) If these appliances worked, and now don't I'd check the condition of the house batteries. Check for water, specific gravity, then disconnect and clean all cable connections, especially the ground connections.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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